Abstract: The control system of eight claw intra-row mechanical weeding device was designed based on LabVIEW. The system utilized the distance between shovel teeth and plants as a threshold to remove weeds. In order to verify the effect of weeding，an experiment was carried out in laboratory. By analyzing the experimental data of Eight-hoe weeding device, it is proved that it can meet the requirements of weed and avoiding to injure crops. The mechanical weeding device with the control system could reduce the injury rate of crops to within 10% and make the coverage rate of plant spacing up to 50% while the plant spacing was more than 0.3m. And it is also found the factors that damage seedlings are related to trolley displacement error, electromagnetic devices operate time, the initial position of shovel teeth.